2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
38 /* cut down ridiculously long IB macro names */
39 #define OP(x) IB_OPCODE_RC_##x
41 static void rc_timeout(unsigned long arg);
43 static u32 restart_sge(struct qib_sge_state *ss, struct qib_swqe *wqe,
48 len = ((psn - wqe->psn) & QIB_PSN_MASK) * pmtu;
49 ss->sge = wqe->sg_list[0];
50 ss->sg_list = wqe->sg_list + 1;
51 ss->num_sge = wqe->wr.num_sge;
52 ss->total_len = wqe->length;
53 qib_skip_sge(ss, len, 0);
54 return wqe->length - len;
57 static void start_timer(struct qib_qp *qp)
59 qp->s_flags |= QIB_S_TIMER;
60 qp->s_timer.function = rc_timeout;
61 /* 4.096 usec. * (1 << qp->timeout) */
62 qp->s_timer.expires = jiffies + qp->timeout_jiffies;
63 add_timer(&qp->s_timer);
67 * qib_make_rc_ack - construct a response packet (ACK, NAK, or RDMA read)
68 * @dev: the device for this QP
69 * @qp: a pointer to the QP
70 * @ohdr: a pointer to the IB header being constructed
73 * Return 1 if constructed; otherwise, return 0.
74 * Note that we are in the responder's side of the QP context.
75 * Note the QP s_lock must be held.
77 static int qib_make_rc_ack(struct qib_ibdev *dev, struct qib_qp *qp,
78 struct qib_other_headers *ohdr, u32 pmtu)
80 struct qib_ack_entry *e;
86 /* Don't send an ACK if we aren't supposed to. */
87 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK))
90 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
93 switch (qp->s_ack_state) {
94 case OP(RDMA_READ_RESPONSE_LAST):
95 case OP(RDMA_READ_RESPONSE_ONLY):
96 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
98 qib_put_mr(e->rdma_sge.mr);
99 e->rdma_sge.mr = NULL;
102 case OP(ATOMIC_ACKNOWLEDGE):
104 * We can increment the tail pointer now that the last
105 * response has been sent instead of only being
108 if (++qp->s_tail_ack_queue > QIB_MAX_RDMA_ATOMIC)
109 qp->s_tail_ack_queue = 0;
112 case OP(ACKNOWLEDGE):
113 /* Check for no next entry in the queue. */
114 if (qp->r_head_ack_queue == qp->s_tail_ack_queue) {
115 if (qp->s_flags & QIB_S_ACK_PENDING)
120 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
121 if (e->opcode == OP(RDMA_READ_REQUEST)) {
123 * If a RDMA read response is being resent and
124 * we haven't seen the duplicate request yet,
125 * then stop sending the remaining responses the
126 * responder has seen until the requester resends it.
128 len = e->rdma_sge.sge_length;
129 if (len && !e->rdma_sge.mr) {
130 qp->s_tail_ack_queue = qp->r_head_ack_queue;
133 /* Copy SGE state in case we need to resend */
134 qp->s_rdma_mr = e->rdma_sge.mr;
136 qib_get_mr(qp->s_rdma_mr);
137 qp->s_ack_rdma_sge.sge = e->rdma_sge;
138 qp->s_ack_rdma_sge.num_sge = 1;
139 qp->s_cur_sge = &qp->s_ack_rdma_sge;
142 qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST);
144 qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY);
147 ohdr->u.aeth = qib_compute_aeth(qp);
149 qp->s_ack_rdma_psn = e->psn;
150 bth2 = qp->s_ack_rdma_psn++ & QIB_PSN_MASK;
152 /* COMPARE_SWAP or FETCH_ADD */
153 qp->s_cur_sge = NULL;
155 qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE);
156 ohdr->u.at.aeth = qib_compute_aeth(qp);
157 ohdr->u.at.atomic_ack_eth[0] =
158 cpu_to_be32(e->atomic_data >> 32);
159 ohdr->u.at.atomic_ack_eth[1] =
160 cpu_to_be32(e->atomic_data);
161 hwords += sizeof(ohdr->u.at) / sizeof(u32);
162 bth2 = e->psn & QIB_PSN_MASK;
165 bth0 = qp->s_ack_state << 24;
168 case OP(RDMA_READ_RESPONSE_FIRST):
169 qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE);
171 case OP(RDMA_READ_RESPONSE_MIDDLE):
172 qp->s_cur_sge = &qp->s_ack_rdma_sge;
173 qp->s_rdma_mr = qp->s_ack_rdma_sge.sge.mr;
175 qib_get_mr(qp->s_rdma_mr);
176 len = qp->s_ack_rdma_sge.sge.sge_length;
180 ohdr->u.aeth = qib_compute_aeth(qp);
182 qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
183 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
186 bth0 = qp->s_ack_state << 24;
187 bth2 = qp->s_ack_rdma_psn++ & QIB_PSN_MASK;
193 * Send a regular ACK.
194 * Set the s_ack_state so we wait until after sending
195 * the ACK before setting s_ack_state to ACKNOWLEDGE
198 qp->s_ack_state = OP(SEND_ONLY);
199 qp->s_flags &= ~QIB_S_ACK_PENDING;
200 qp->s_cur_sge = NULL;
203 cpu_to_be32((qp->r_msn & QIB_MSN_MASK) |
205 QIB_AETH_CREDIT_SHIFT));
207 ohdr->u.aeth = qib_compute_aeth(qp);
210 bth0 = OP(ACKNOWLEDGE) << 24;
211 bth2 = qp->s_ack_psn & QIB_PSN_MASK;
213 qp->s_rdma_ack_cnt++;
214 qp->s_hdrwords = hwords;
215 qp->s_cur_size = len;
216 qib_make_ruc_header(qp, ohdr, bth0, bth2);
220 qp->s_ack_state = OP(ACKNOWLEDGE);
221 qp->s_flags &= ~(QIB_S_RESP_PENDING | QIB_S_ACK_PENDING);
226 * qib_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC)
227 * @qp: a pointer to the QP
229 * Return 1 if constructed; otherwise, return 0.
231 int qib_make_rc_req(struct qib_qp *qp)
233 struct qib_ibdev *dev = to_idev(qp->ibqp.device);
234 struct qib_other_headers *ohdr;
235 struct qib_sge_state *ss;
236 struct qib_swqe *wqe;
247 ohdr = &qp->s_hdr->u.oth;
248 if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
249 ohdr = &qp->s_hdr->u.l.oth;
252 * The lock is needed to synchronize between the sending tasklet,
253 * the receive interrupt handler, and timeout resends.
255 spin_lock_irqsave(&qp->s_lock, flags);
257 /* Sending responses has higher priority over sending requests. */
258 if ((qp->s_flags & QIB_S_RESP_PENDING) &&
259 qib_make_rc_ack(dev, qp, ohdr, pmtu))
262 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_SEND_OK)) {
263 if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND))
265 /* We are in the error state, flush the work request. */
266 if (qp->s_last == qp->s_head)
268 /* If DMAs are in progress, we can't flush immediately. */
269 if (atomic_read(&qp->s_dma_busy)) {
270 qp->s_flags |= QIB_S_WAIT_DMA;
273 wqe = get_swqe_ptr(qp, qp->s_last);
274 qib_send_complete(qp, wqe, qp->s_last != qp->s_acked ?
275 IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR);
276 /* will get called again */
280 if (qp->s_flags & (QIB_S_WAIT_RNR | QIB_S_WAIT_ACK))
283 if (qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) {
284 if (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) {
285 qp->s_flags |= QIB_S_WAIT_PSN;
288 qp->s_sending_psn = qp->s_psn;
289 qp->s_sending_hpsn = qp->s_psn - 1;
292 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
296 /* Send a request. */
297 wqe = get_swqe_ptr(qp, qp->s_cur);
298 switch (qp->s_state) {
300 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_NEXT_SEND_OK))
303 * Resend an old request or start a new one.
305 * We keep track of the current SWQE so that
306 * we don't reset the "furthest progress" state
307 * if we need to back up.
310 if (qp->s_cur == qp->s_tail) {
311 /* Check if send work queue is empty. */
312 if (qp->s_tail == qp->s_head)
315 * If a fence is requested, wait for previous
316 * RDMA read and atomic operations to finish.
318 if ((wqe->wr.send_flags & IB_SEND_FENCE) &&
319 qp->s_num_rd_atomic) {
320 qp->s_flags |= QIB_S_WAIT_FENCE;
323 wqe->psn = qp->s_next_psn;
327 * Note that we have to be careful not to modify the
328 * original work request since we may need to resend
333 bth2 = qp->s_psn & QIB_PSN_MASK;
334 switch (wqe->wr.opcode) {
336 case IB_WR_SEND_WITH_IMM:
337 /* If no credit, return. */
338 if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT) &&
339 qib_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) {
340 qp->s_flags |= QIB_S_WAIT_SSN_CREDIT;
343 wqe->lpsn = wqe->psn;
345 wqe->lpsn += (len - 1) / pmtu;
346 qp->s_state = OP(SEND_FIRST);
350 if (wqe->wr.opcode == IB_WR_SEND)
351 qp->s_state = OP(SEND_ONLY);
353 qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE);
354 /* Immediate data comes after the BTH */
355 ohdr->u.imm_data = wqe->wr.ex.imm_data;
358 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
359 bth0 |= IB_BTH_SOLICITED;
360 bth2 |= IB_BTH_REQ_ACK;
361 if (++qp->s_cur == qp->s_size)
365 case IB_WR_RDMA_WRITE:
366 if (newreq && !(qp->s_flags & QIB_S_UNLIMITED_CREDIT))
369 case IB_WR_RDMA_WRITE_WITH_IMM:
370 /* If no credit, return. */
371 if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT) &&
372 qib_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) {
373 qp->s_flags |= QIB_S_WAIT_SSN_CREDIT;
377 ohdr->u.rc.reth.vaddr =
378 cpu_to_be64(wqe->rdma_wr.remote_addr);
379 ohdr->u.rc.reth.rkey =
380 cpu_to_be32(wqe->rdma_wr.rkey);
381 ohdr->u.rc.reth.length = cpu_to_be32(len);
382 hwords += sizeof(struct ib_reth) / sizeof(u32);
383 wqe->lpsn = wqe->psn;
385 wqe->lpsn += (len - 1) / pmtu;
386 qp->s_state = OP(RDMA_WRITE_FIRST);
390 if (wqe->rdma_wr.wr.opcode == IB_WR_RDMA_WRITE)
391 qp->s_state = OP(RDMA_WRITE_ONLY);
393 qp->s_state = OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
394 /* Immediate data comes after RETH */
395 ohdr->u.rc.imm_data =
396 wqe->rdma_wr.wr.ex.imm_data;
398 if (wqe->rdma_wr.wr.send_flags & IB_SEND_SOLICITED)
399 bth0 |= IB_BTH_SOLICITED;
401 bth2 |= IB_BTH_REQ_ACK;
402 if (++qp->s_cur == qp->s_size)
406 case IB_WR_RDMA_READ:
408 * Don't allow more operations to be started
409 * than the QP limits allow.
412 if (qp->s_num_rd_atomic >=
413 qp->s_max_rd_atomic) {
414 qp->s_flags |= QIB_S_WAIT_RDMAR;
417 qp->s_num_rd_atomic++;
418 if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT))
421 * Adjust s_next_psn to count the
422 * expected number of responses.
425 qp->s_next_psn += (len - 1) / pmtu;
426 wqe->lpsn = qp->s_next_psn++;
429 ohdr->u.rc.reth.vaddr =
430 cpu_to_be64(wqe->rdma_wr.remote_addr);
431 ohdr->u.rc.reth.rkey =
432 cpu_to_be32(wqe->rdma_wr.rkey);
433 ohdr->u.rc.reth.length = cpu_to_be32(len);
434 qp->s_state = OP(RDMA_READ_REQUEST);
435 hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
438 bth2 |= IB_BTH_REQ_ACK;
439 if (++qp->s_cur == qp->s_size)
443 case IB_WR_ATOMIC_CMP_AND_SWP:
444 case IB_WR_ATOMIC_FETCH_AND_ADD:
446 * Don't allow more operations to be started
447 * than the QP limits allow.
450 if (qp->s_num_rd_atomic >=
451 qp->s_max_rd_atomic) {
452 qp->s_flags |= QIB_S_WAIT_RDMAR;
455 qp->s_num_rd_atomic++;
456 if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT))
458 wqe->lpsn = wqe->psn;
460 if (wqe->atomic_wr.wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
461 qp->s_state = OP(COMPARE_SWAP);
462 ohdr->u.atomic_eth.swap_data = cpu_to_be64(
463 wqe->atomic_wr.swap);
464 ohdr->u.atomic_eth.compare_data = cpu_to_be64(
465 wqe->atomic_wr.compare_add);
467 qp->s_state = OP(FETCH_ADD);
468 ohdr->u.atomic_eth.swap_data = cpu_to_be64(
469 wqe->atomic_wr.compare_add);
470 ohdr->u.atomic_eth.compare_data = 0;
472 ohdr->u.atomic_eth.vaddr[0] = cpu_to_be32(
473 wqe->atomic_wr.remote_addr >> 32);
474 ohdr->u.atomic_eth.vaddr[1] = cpu_to_be32(
475 wqe->atomic_wr.remote_addr);
476 ohdr->u.atomic_eth.rkey = cpu_to_be32(
477 wqe->atomic_wr.rkey);
478 hwords += sizeof(struct ib_atomic_eth) / sizeof(u32);
481 bth2 |= IB_BTH_REQ_ACK;
482 if (++qp->s_cur == qp->s_size)
489 qp->s_sge.sge = wqe->sg_list[0];
490 qp->s_sge.sg_list = wqe->sg_list + 1;
491 qp->s_sge.num_sge = wqe->wr.num_sge;
492 qp->s_sge.total_len = wqe->length;
493 qp->s_len = wqe->length;
496 if (qp->s_tail >= qp->s_size)
499 if (wqe->wr.opcode == IB_WR_RDMA_READ)
500 qp->s_psn = wqe->lpsn + 1;
503 if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0)
504 qp->s_next_psn = qp->s_psn;
508 case OP(RDMA_READ_RESPONSE_FIRST):
510 * qp->s_state is normally set to the opcode of the
511 * last packet constructed for new requests and therefore
512 * is never set to RDMA read response.
513 * RDMA_READ_RESPONSE_FIRST is used by the ACK processing
514 * thread to indicate a SEND needs to be restarted from an
515 * earlier PSN without interferring with the sending thread.
516 * See qib_restart_rc().
518 qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
521 qp->s_state = OP(SEND_MIDDLE);
523 case OP(SEND_MIDDLE):
524 bth2 = qp->s_psn++ & QIB_PSN_MASK;
525 if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0)
526 qp->s_next_psn = qp->s_psn;
533 if (wqe->wr.opcode == IB_WR_SEND)
534 qp->s_state = OP(SEND_LAST);
536 qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
537 /* Immediate data comes after the BTH */
538 ohdr->u.imm_data = wqe->wr.ex.imm_data;
541 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
542 bth0 |= IB_BTH_SOLICITED;
543 bth2 |= IB_BTH_REQ_ACK;
545 if (qp->s_cur >= qp->s_size)
549 case OP(RDMA_READ_RESPONSE_LAST):
551 * qp->s_state is normally set to the opcode of the
552 * last packet constructed for new requests and therefore
553 * is never set to RDMA read response.
554 * RDMA_READ_RESPONSE_LAST is used by the ACK processing
555 * thread to indicate a RDMA write needs to be restarted from
556 * an earlier PSN without interferring with the sending thread.
557 * See qib_restart_rc().
559 qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
561 case OP(RDMA_WRITE_FIRST):
562 qp->s_state = OP(RDMA_WRITE_MIDDLE);
564 case OP(RDMA_WRITE_MIDDLE):
565 bth2 = qp->s_psn++ & QIB_PSN_MASK;
566 if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0)
567 qp->s_next_psn = qp->s_psn;
574 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
575 qp->s_state = OP(RDMA_WRITE_LAST);
577 qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
578 /* Immediate data comes after the BTH */
579 ohdr->u.imm_data = wqe->wr.ex.imm_data;
581 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
582 bth0 |= IB_BTH_SOLICITED;
584 bth2 |= IB_BTH_REQ_ACK;
586 if (qp->s_cur >= qp->s_size)
590 case OP(RDMA_READ_RESPONSE_MIDDLE):
592 * qp->s_state is normally set to the opcode of the
593 * last packet constructed for new requests and therefore
594 * is never set to RDMA read response.
595 * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing
596 * thread to indicate a RDMA read needs to be restarted from
597 * an earlier PSN without interferring with the sending thread.
598 * See qib_restart_rc().
600 len = ((qp->s_psn - wqe->psn) & QIB_PSN_MASK) * pmtu;
601 ohdr->u.rc.reth.vaddr =
602 cpu_to_be64(wqe->rdma_wr.remote_addr + len);
603 ohdr->u.rc.reth.rkey =
604 cpu_to_be32(wqe->rdma_wr.rkey);
605 ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len);
606 qp->s_state = OP(RDMA_READ_REQUEST);
607 hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
608 bth2 = (qp->s_psn & QIB_PSN_MASK) | IB_BTH_REQ_ACK;
609 qp->s_psn = wqe->lpsn + 1;
613 if (qp->s_cur == qp->s_size)
617 qp->s_sending_hpsn = bth2;
618 delta = (((int) bth2 - (int) wqe->psn) << 8) >> 8;
619 if (delta && delta % QIB_PSN_CREDIT == 0)
620 bth2 |= IB_BTH_REQ_ACK;
621 if (qp->s_flags & QIB_S_SEND_ONE) {
622 qp->s_flags &= ~QIB_S_SEND_ONE;
623 qp->s_flags |= QIB_S_WAIT_ACK;
624 bth2 |= IB_BTH_REQ_ACK;
627 qp->s_hdrwords = hwords;
629 qp->s_cur_size = len;
630 qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), bth2);
636 qp->s_flags &= ~QIB_S_BUSY;
638 spin_unlock_irqrestore(&qp->s_lock, flags);
643 * qib_send_rc_ack - Construct an ACK packet and send it
644 * @qp: a pointer to the QP
646 * This is called from qib_rc_rcv() and qib_kreceive().
647 * Note that RDMA reads and atomics are handled in the
648 * send side QP state and tasklet.
650 void qib_send_rc_ack(struct qib_qp *qp)
652 struct qib_devdata *dd = dd_from_ibdev(qp->ibqp.device);
653 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
654 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
661 struct qib_ib_header hdr;
662 struct qib_other_headers *ohdr;
666 spin_lock_irqsave(&qp->s_lock, flags);
668 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK))
671 /* Don't send ACK or NAK if a RDMA read or atomic is pending. */
672 if ((qp->s_flags & QIB_S_RESP_PENDING) || qp->s_rdma_ack_cnt)
675 /* Construct the header with s_lock held so APM doesn't change it. */
678 /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */
680 if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
681 hwords += qib_make_grh(ibp, &hdr.u.l.grh,
682 &qp->remote_ah_attr.grh, hwords, 0);
686 /* read pkey_index w/o lock (its atomic) */
687 bth0 = qib_get_pkey(ibp, qp->s_pkey_index) | (OP(ACKNOWLEDGE) << 24);
688 if (qp->s_mig_state == IB_MIG_MIGRATED)
689 bth0 |= IB_BTH_MIG_REQ;
691 ohdr->u.aeth = cpu_to_be32((qp->r_msn & QIB_MSN_MASK) |
693 QIB_AETH_CREDIT_SHIFT));
695 ohdr->u.aeth = qib_compute_aeth(qp);
696 lrh0 |= ibp->sl_to_vl[qp->remote_ah_attr.sl] << 12 |
697 qp->remote_ah_attr.sl << 4;
698 hdr.lrh[0] = cpu_to_be16(lrh0);
699 hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
700 hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC);
701 hdr.lrh[3] = cpu_to_be16(ppd->lid | qp->remote_ah_attr.src_path_bits);
702 ohdr->bth[0] = cpu_to_be32(bth0);
703 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
704 ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & QIB_PSN_MASK);
706 spin_unlock_irqrestore(&qp->s_lock, flags);
708 /* Don't try to send ACKs if the link isn't ACTIVE */
709 if (!(ppd->lflags & QIBL_LINKACTIVE))
712 control = dd->f_setpbc_control(ppd, hwords + SIZE_OF_CRC,
713 qp->s_srate, lrh0 >> 12);
714 /* length is + 1 for the control dword */
715 pbc = ((u64) control << 32) | (hwords + 1);
717 piobuf = dd->f_getsendbuf(ppd, pbc, &pbufn);
720 * We are out of PIO buffers at the moment.
721 * Pass responsibility for sending the ACK to the
722 * send tasklet so that when a PIO buffer becomes
723 * available, the ACK is sent ahead of other outgoing
726 spin_lock_irqsave(&qp->s_lock, flags);
732 * We have to flush after the PBC for correctness
733 * on some cpus or WC buffer can be written out of order.
737 if (dd->flags & QIB_PIO_FLUSH_WC) {
738 u32 *hdrp = (u32 *) &hdr;
741 qib_pio_copy(piobuf + 2, hdrp, hwords - 1);
743 __raw_writel(hdrp[hwords - 1], piobuf + hwords + 1);
745 qib_pio_copy(piobuf + 2, (u32 *) &hdr, hwords);
747 if (dd->flags & QIB_USE_SPCL_TRIG) {
748 u32 spcl_off = (pbufn >= dd->piobcnt2k) ? 2047 : 1023;
751 __raw_writel(0xaebecede, piobuf + spcl_off);
755 qib_sendbuf_done(dd, pbufn);
757 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
761 if (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) {
763 qp->s_flags |= QIB_S_ACK_PENDING | QIB_S_RESP_PENDING;
764 qp->s_nak_state = qp->r_nak_state;
765 qp->s_ack_psn = qp->r_ack_psn;
767 /* Schedule the send tasklet. */
768 qib_schedule_send(qp);
771 spin_unlock_irqrestore(&qp->s_lock, flags);
777 * reset_psn - reset the QP state to send starting from PSN
779 * @psn: the packet sequence number to restart at
781 * This is called from qib_rc_rcv() to process an incoming RC ACK
783 * Called at interrupt level with the QP s_lock held.
785 static void reset_psn(struct qib_qp *qp, u32 psn)
788 struct qib_swqe *wqe = get_swqe_ptr(qp, n);
794 * If we are starting the request from the beginning,
795 * let the normal send code handle initialization.
797 if (qib_cmp24(psn, wqe->psn) <= 0) {
798 qp->s_state = OP(SEND_LAST);
802 /* Find the work request opcode corresponding to the given PSN. */
803 opcode = wqe->wr.opcode;
807 if (++n == qp->s_size)
811 wqe = get_swqe_ptr(qp, n);
812 diff = qib_cmp24(psn, wqe->psn);
817 * If we are starting the request from the beginning,
818 * let the normal send code handle initialization.
821 qp->s_state = OP(SEND_LAST);
824 opcode = wqe->wr.opcode;
828 * Set the state to restart in the middle of a request.
829 * Don't change the s_sge, s_cur_sge, or s_cur_size.
830 * See qib_make_rc_req().
834 case IB_WR_SEND_WITH_IMM:
835 qp->s_state = OP(RDMA_READ_RESPONSE_FIRST);
838 case IB_WR_RDMA_WRITE:
839 case IB_WR_RDMA_WRITE_WITH_IMM:
840 qp->s_state = OP(RDMA_READ_RESPONSE_LAST);
843 case IB_WR_RDMA_READ:
844 qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE);
849 * This case shouldn't happen since its only
852 qp->s_state = OP(SEND_LAST);
857 * Set QIB_S_WAIT_PSN as qib_rc_complete() may start the timer
858 * asynchronously before the send tasklet can get scheduled.
859 * Doing it in qib_make_rc_req() is too late.
861 if ((qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) &&
862 (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0))
863 qp->s_flags |= QIB_S_WAIT_PSN;
867 * Back up requester to resend the last un-ACKed request.
868 * The QP r_lock and s_lock should be held and interrupts disabled.
870 static void qib_restart_rc(struct qib_qp *qp, u32 psn, int wait)
872 struct qib_swqe *wqe = get_swqe_ptr(qp, qp->s_acked);
873 struct qib_ibport *ibp;
875 if (qp->s_retry == 0) {
876 if (qp->s_mig_state == IB_MIG_ARMED) {
878 qp->s_retry = qp->s_retry_cnt;
879 } else if (qp->s_last == qp->s_acked) {
880 qib_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR);
881 qib_error_qp(qp, IB_WC_WR_FLUSH_ERR);
883 } else /* XXX need to handle delayed completion */
888 ibp = to_iport(qp->ibqp.device, qp->port_num);
889 if (wqe->wr.opcode == IB_WR_RDMA_READ)
892 ibp->n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK;
894 qp->s_flags &= ~(QIB_S_WAIT_FENCE | QIB_S_WAIT_RDMAR |
895 QIB_S_WAIT_SSN_CREDIT | QIB_S_WAIT_PSN |
898 qp->s_flags |= QIB_S_SEND_ONE;
903 * This is called from s_timer for missing responses.
905 static void rc_timeout(unsigned long arg)
907 struct qib_qp *qp = (struct qib_qp *)arg;
908 struct qib_ibport *ibp;
911 spin_lock_irqsave(&qp->r_lock, flags);
912 spin_lock(&qp->s_lock);
913 if (qp->s_flags & QIB_S_TIMER) {
914 ibp = to_iport(qp->ibqp.device, qp->port_num);
915 ibp->n_rc_timeouts++;
916 qp->s_flags &= ~QIB_S_TIMER;
917 del_timer(&qp->s_timer);
918 qib_restart_rc(qp, qp->s_last_psn + 1, 1);
919 qib_schedule_send(qp);
921 spin_unlock(&qp->s_lock);
922 spin_unlock_irqrestore(&qp->r_lock, flags);
926 * This is called from s_timer for RNR timeouts.
928 void qib_rc_rnr_retry(unsigned long arg)
930 struct qib_qp *qp = (struct qib_qp *)arg;
933 spin_lock_irqsave(&qp->s_lock, flags);
934 if (qp->s_flags & QIB_S_WAIT_RNR) {
935 qp->s_flags &= ~QIB_S_WAIT_RNR;
936 del_timer(&qp->s_timer);
937 qib_schedule_send(qp);
939 spin_unlock_irqrestore(&qp->s_lock, flags);
943 * Set qp->s_sending_psn to the next PSN after the given one.
944 * This would be psn+1 except when RDMA reads are present.
946 static void reset_sending_psn(struct qib_qp *qp, u32 psn)
948 struct qib_swqe *wqe;
951 /* Find the work request corresponding to the given PSN. */
953 wqe = get_swqe_ptr(qp, n);
954 if (qib_cmp24(psn, wqe->lpsn) <= 0) {
955 if (wqe->wr.opcode == IB_WR_RDMA_READ)
956 qp->s_sending_psn = wqe->lpsn + 1;
958 qp->s_sending_psn = psn + 1;
961 if (++n == qp->s_size)
969 * This should be called with the QP s_lock held and interrupts disabled.
971 void qib_rc_send_complete(struct qib_qp *qp, struct qib_ib_header *hdr)
973 struct qib_other_headers *ohdr;
974 struct qib_swqe *wqe;
980 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_OR_FLUSH_SEND))
983 /* Find out where the BTH is */
984 if ((be16_to_cpu(hdr->lrh[0]) & 3) == QIB_LRH_BTH)
987 ohdr = &hdr->u.l.oth;
989 opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
990 if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
991 opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
992 WARN_ON(!qp->s_rdma_ack_cnt);
993 qp->s_rdma_ack_cnt--;
997 psn = be32_to_cpu(ohdr->bth[2]);
998 reset_sending_psn(qp, psn);
1001 * Start timer after a packet requesting an ACK has been sent and
1002 * there are still requests that haven't been acked.
1004 if ((psn & IB_BTH_REQ_ACK) && qp->s_acked != qp->s_tail &&
1005 !(qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR | QIB_S_WAIT_PSN)) &&
1006 (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK))
1009 while (qp->s_last != qp->s_acked) {
1010 wqe = get_swqe_ptr(qp, qp->s_last);
1011 if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) >= 0 &&
1012 qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)
1014 for (i = 0; i < wqe->wr.num_sge; i++) {
1015 struct qib_sge *sge = &wqe->sg_list[i];
1017 qib_put_mr(sge->mr);
1019 /* Post a send completion queue entry if requested. */
1020 if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) ||
1021 (wqe->wr.send_flags & IB_SEND_SIGNALED)) {
1022 memset(&wc, 0, sizeof(wc));
1023 wc.wr_id = wqe->wr.wr_id;
1024 wc.status = IB_WC_SUCCESS;
1025 wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode];
1026 wc.byte_len = wqe->length;
1028 qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0);
1030 if (++qp->s_last >= qp->s_size)
1034 * If we were waiting for sends to complete before resending,
1035 * and they are now complete, restart sending.
1037 if (qp->s_flags & QIB_S_WAIT_PSN &&
1038 qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0) {
1039 qp->s_flags &= ~QIB_S_WAIT_PSN;
1040 qp->s_sending_psn = qp->s_psn;
1041 qp->s_sending_hpsn = qp->s_psn - 1;
1042 qib_schedule_send(qp);
1046 static inline void update_last_psn(struct qib_qp *qp, u32 psn)
1048 qp->s_last_psn = psn;
1052 * Generate a SWQE completion.
1053 * This is similar to qib_send_complete but has to check to be sure
1054 * that the SGEs are not being referenced if the SWQE is being resent.
1056 static struct qib_swqe *do_rc_completion(struct qib_qp *qp,
1057 struct qib_swqe *wqe,
1058 struct qib_ibport *ibp)
1064 * Don't decrement refcount and don't generate a
1065 * completion if the SWQE is being resent until the send
1068 if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) < 0 ||
1069 qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0) {
1070 for (i = 0; i < wqe->wr.num_sge; i++) {
1071 struct qib_sge *sge = &wqe->sg_list[i];
1073 qib_put_mr(sge->mr);
1075 /* Post a send completion queue entry if requested. */
1076 if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) ||
1077 (wqe->wr.send_flags & IB_SEND_SIGNALED)) {
1078 memset(&wc, 0, sizeof(wc));
1079 wc.wr_id = wqe->wr.wr_id;
1080 wc.status = IB_WC_SUCCESS;
1081 wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode];
1082 wc.byte_len = wqe->length;
1084 qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0);
1086 if (++qp->s_last >= qp->s_size)
1089 ibp->n_rc_delayed_comp++;
1091 qp->s_retry = qp->s_retry_cnt;
1092 update_last_psn(qp, wqe->lpsn);
1095 * If we are completing a request which is in the process of
1096 * being resent, we can stop resending it since we know the
1097 * responder has already seen it.
1099 if (qp->s_acked == qp->s_cur) {
1100 if (++qp->s_cur >= qp->s_size)
1102 qp->s_acked = qp->s_cur;
1103 wqe = get_swqe_ptr(qp, qp->s_cur);
1104 if (qp->s_acked != qp->s_tail) {
1105 qp->s_state = OP(SEND_LAST);
1106 qp->s_psn = wqe->psn;
1109 if (++qp->s_acked >= qp->s_size)
1111 if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur)
1113 wqe = get_swqe_ptr(qp, qp->s_acked);
1119 * do_rc_ack - process an incoming RC ACK
1120 * @qp: the QP the ACK came in on
1121 * @psn: the packet sequence number of the ACK
1122 * @opcode: the opcode of the request that resulted in the ACK
1124 * This is called from qib_rc_rcv_resp() to process an incoming RC ACK
1126 * Called at interrupt level with the QP s_lock held.
1127 * Returns 1 if OK, 0 if current operation should be aborted (NAK).
1129 static int do_rc_ack(struct qib_qp *qp, u32 aeth, u32 psn, int opcode,
1130 u64 val, struct qib_ctxtdata *rcd)
1132 struct qib_ibport *ibp;
1133 enum ib_wc_status status;
1134 struct qib_swqe *wqe;
1139 /* Remove QP from retry timer */
1140 if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) {
1141 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR);
1142 del_timer(&qp->s_timer);
1146 * Note that NAKs implicitly ACK outstanding SEND and RDMA write
1147 * requests and implicitly NAK RDMA read and atomic requests issued
1148 * before the NAK'ed request. The MSN won't include the NAK'ed
1149 * request but will include an ACK'ed request(s).
1154 wqe = get_swqe_ptr(qp, qp->s_acked);
1155 ibp = to_iport(qp->ibqp.device, qp->port_num);
1158 * The MSN might be for a later WQE than the PSN indicates so
1159 * only complete WQEs that the PSN finishes.
1161 while ((diff = qib_cmp24(ack_psn, wqe->lpsn)) >= 0) {
1163 * RDMA_READ_RESPONSE_ONLY is a special case since
1164 * we want to generate completion events for everything
1165 * before the RDMA read, copy the data, then generate
1166 * the completion for the read.
1168 if (wqe->wr.opcode == IB_WR_RDMA_READ &&
1169 opcode == OP(RDMA_READ_RESPONSE_ONLY) &&
1175 * If this request is a RDMA read or atomic, and the ACK is
1176 * for a later operation, this ACK NAKs the RDMA read or
1177 * atomic. In other words, only a RDMA_READ_LAST or ONLY
1178 * can ACK a RDMA read and likewise for atomic ops. Note
1179 * that the NAK case can only happen if relaxed ordering is
1180 * used and requests are sent after an RDMA read or atomic
1181 * is sent but before the response is received.
1183 if ((wqe->wr.opcode == IB_WR_RDMA_READ &&
1184 (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) ||
1185 ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
1186 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) &&
1187 (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) {
1188 /* Retry this request. */
1189 if (!(qp->r_flags & QIB_R_RDMAR_SEQ)) {
1190 qp->r_flags |= QIB_R_RDMAR_SEQ;
1191 qib_restart_rc(qp, qp->s_last_psn + 1, 0);
1192 if (list_empty(&qp->rspwait)) {
1193 qp->r_flags |= QIB_R_RSP_SEND;
1194 atomic_inc(&qp->refcount);
1195 list_add_tail(&qp->rspwait,
1196 &rcd->qp_wait_list);
1200 * No need to process the ACK/NAK since we are
1201 * restarting an earlier request.
1205 if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
1206 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) {
1207 u64 *vaddr = wqe->sg_list[0].vaddr;
1210 if (qp->s_num_rd_atomic &&
1211 (wqe->wr.opcode == IB_WR_RDMA_READ ||
1212 wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
1213 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) {
1214 qp->s_num_rd_atomic--;
1215 /* Restart sending task if fence is complete */
1216 if ((qp->s_flags & QIB_S_WAIT_FENCE) &&
1217 !qp->s_num_rd_atomic) {
1218 qp->s_flags &= ~(QIB_S_WAIT_FENCE |
1220 qib_schedule_send(qp);
1221 } else if (qp->s_flags & QIB_S_WAIT_RDMAR) {
1222 qp->s_flags &= ~(QIB_S_WAIT_RDMAR |
1224 qib_schedule_send(qp);
1227 wqe = do_rc_completion(qp, wqe, ibp);
1228 if (qp->s_acked == qp->s_tail)
1232 switch (aeth >> 29) {
1235 if (qp->s_acked != qp->s_tail) {
1237 * We are expecting more ACKs so
1238 * reset the retransmit timer.
1242 * We can stop resending the earlier packets and
1243 * continue with the next packet the receiver wants.
1245 if (qib_cmp24(qp->s_psn, psn) <= 0)
1246 reset_psn(qp, psn + 1);
1247 } else if (qib_cmp24(qp->s_psn, psn) <= 0) {
1248 qp->s_state = OP(SEND_LAST);
1249 qp->s_psn = psn + 1;
1251 if (qp->s_flags & QIB_S_WAIT_ACK) {
1252 qp->s_flags &= ~QIB_S_WAIT_ACK;
1253 qib_schedule_send(qp);
1255 qib_get_credit(qp, aeth);
1256 qp->s_rnr_retry = qp->s_rnr_retry_cnt;
1257 qp->s_retry = qp->s_retry_cnt;
1258 update_last_psn(qp, psn);
1262 case 1: /* RNR NAK */
1264 if (qp->s_acked == qp->s_tail)
1266 if (qp->s_flags & QIB_S_WAIT_RNR)
1268 if (qp->s_rnr_retry == 0) {
1269 status = IB_WC_RNR_RETRY_EXC_ERR;
1272 if (qp->s_rnr_retry_cnt < 7)
1275 /* The last valid PSN is the previous PSN. */
1276 update_last_psn(qp, psn - 1);
1278 ibp->n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK;
1282 qp->s_flags &= ~(QIB_S_WAIT_SSN_CREDIT | QIB_S_WAIT_ACK);
1283 qp->s_flags |= QIB_S_WAIT_RNR;
1284 qp->s_timer.function = qib_rc_rnr_retry;
1285 qp->s_timer.expires = jiffies + usecs_to_jiffies(
1286 ib_qib_rnr_table[(aeth >> QIB_AETH_CREDIT_SHIFT) &
1287 QIB_AETH_CREDIT_MASK]);
1288 add_timer(&qp->s_timer);
1292 if (qp->s_acked == qp->s_tail)
1294 /* The last valid PSN is the previous PSN. */
1295 update_last_psn(qp, psn - 1);
1296 switch ((aeth >> QIB_AETH_CREDIT_SHIFT) &
1297 QIB_AETH_CREDIT_MASK) {
1298 case 0: /* PSN sequence error */
1301 * Back up to the responder's expected PSN.
1302 * Note that we might get a NAK in the middle of an
1303 * RDMA READ response which terminates the RDMA
1306 qib_restart_rc(qp, psn, 0);
1307 qib_schedule_send(qp);
1310 case 1: /* Invalid Request */
1311 status = IB_WC_REM_INV_REQ_ERR;
1312 ibp->n_other_naks++;
1315 case 2: /* Remote Access Error */
1316 status = IB_WC_REM_ACCESS_ERR;
1317 ibp->n_other_naks++;
1320 case 3: /* Remote Operation Error */
1321 status = IB_WC_REM_OP_ERR;
1322 ibp->n_other_naks++;
1324 if (qp->s_last == qp->s_acked) {
1325 qib_send_complete(qp, wqe, status);
1326 qib_error_qp(qp, IB_WC_WR_FLUSH_ERR);
1331 /* Ignore other reserved NAK error codes */
1334 qp->s_retry = qp->s_retry_cnt;
1335 qp->s_rnr_retry = qp->s_rnr_retry_cnt;
1338 default: /* 2: reserved */
1340 /* Ignore reserved NAK codes. */
1349 * We have seen an out of sequence RDMA read middle or last packet.
1350 * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE.
1352 static void rdma_seq_err(struct qib_qp *qp, struct qib_ibport *ibp, u32 psn,
1353 struct qib_ctxtdata *rcd)
1355 struct qib_swqe *wqe;
1357 /* Remove QP from retry timer */
1358 if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) {
1359 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR);
1360 del_timer(&qp->s_timer);
1363 wqe = get_swqe_ptr(qp, qp->s_acked);
1365 while (qib_cmp24(psn, wqe->lpsn) > 0) {
1366 if (wqe->wr.opcode == IB_WR_RDMA_READ ||
1367 wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
1368 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
1370 wqe = do_rc_completion(qp, wqe, ibp);
1374 qp->r_flags |= QIB_R_RDMAR_SEQ;
1375 qib_restart_rc(qp, qp->s_last_psn + 1, 0);
1376 if (list_empty(&qp->rspwait)) {
1377 qp->r_flags |= QIB_R_RSP_SEND;
1378 atomic_inc(&qp->refcount);
1379 list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
1384 * qib_rc_rcv_resp - process an incoming RC response packet
1385 * @ibp: the port this packet came in on
1386 * @ohdr: the other headers for this packet
1387 * @data: the packet data
1388 * @tlen: the packet length
1389 * @qp: the QP for this packet
1390 * @opcode: the opcode for this packet
1391 * @psn: the packet sequence number for this packet
1392 * @hdrsize: the header length
1393 * @pmtu: the path MTU
1395 * This is called from qib_rc_rcv() to process an incoming RC response
1396 * packet for the given QP.
1397 * Called at interrupt level.
1399 static void qib_rc_rcv_resp(struct qib_ibport *ibp,
1400 struct qib_other_headers *ohdr,
1401 void *data, u32 tlen,
1404 u32 psn, u32 hdrsize, u32 pmtu,
1405 struct qib_ctxtdata *rcd)
1407 struct qib_swqe *wqe;
1408 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1409 enum ib_wc_status status;
1410 unsigned long flags;
1416 if (opcode != OP(RDMA_READ_RESPONSE_MIDDLE)) {
1418 * If ACK'd PSN on SDMA busy list try to make progress to
1419 * reclaim SDMA credits.
1421 if ((qib_cmp24(psn, qp->s_sending_psn) >= 0) &&
1422 (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) {
1425 * If send tasklet not running attempt to progress
1428 if (!(qp->s_flags & QIB_S_BUSY)) {
1429 /* Acquire SDMA Lock */
1430 spin_lock_irqsave(&ppd->sdma_lock, flags);
1431 /* Invoke sdma make progress */
1432 qib_sdma_make_progress(ppd);
1433 /* Release SDMA Lock */
1434 spin_unlock_irqrestore(&ppd->sdma_lock, flags);
1439 spin_lock_irqsave(&qp->s_lock, flags);
1440 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK))
1443 /* Ignore invalid responses. */
1444 if (qib_cmp24(psn, qp->s_next_psn) >= 0)
1447 /* Ignore duplicate responses. */
1448 diff = qib_cmp24(psn, qp->s_last_psn);
1449 if (unlikely(diff <= 0)) {
1450 /* Update credits for "ghost" ACKs */
1451 if (diff == 0 && opcode == OP(ACKNOWLEDGE)) {
1452 aeth = be32_to_cpu(ohdr->u.aeth);
1453 if ((aeth >> 29) == 0)
1454 qib_get_credit(qp, aeth);
1460 * Skip everything other than the PSN we expect, if we are waiting
1461 * for a reply to a restarted RDMA read or atomic op.
1463 if (qp->r_flags & QIB_R_RDMAR_SEQ) {
1464 if (qib_cmp24(psn, qp->s_last_psn + 1) != 0)
1466 qp->r_flags &= ~QIB_R_RDMAR_SEQ;
1469 if (unlikely(qp->s_acked == qp->s_tail))
1471 wqe = get_swqe_ptr(qp, qp->s_acked);
1472 status = IB_WC_SUCCESS;
1475 case OP(ACKNOWLEDGE):
1476 case OP(ATOMIC_ACKNOWLEDGE):
1477 case OP(RDMA_READ_RESPONSE_FIRST):
1478 aeth = be32_to_cpu(ohdr->u.aeth);
1479 if (opcode == OP(ATOMIC_ACKNOWLEDGE)) {
1480 __be32 *p = ohdr->u.at.atomic_ack_eth;
1482 val = ((u64) be32_to_cpu(p[0]) << 32) |
1486 if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) ||
1487 opcode != OP(RDMA_READ_RESPONSE_FIRST))
1490 wqe = get_swqe_ptr(qp, qp->s_acked);
1491 if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
1494 * If this is a response to a resent RDMA read, we
1495 * have to be careful to copy the data to the right
1498 qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
1502 case OP(RDMA_READ_RESPONSE_MIDDLE):
1503 /* no AETH, no ACK */
1504 if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1)))
1506 if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
1509 if (unlikely(tlen != (hdrsize + pmtu + 4)))
1511 if (unlikely(pmtu >= qp->s_rdma_read_len))
1515 * We got a response so update the timeout.
1516 * 4.096 usec. * (1 << qp->timeout)
1518 qp->s_flags |= QIB_S_TIMER;
1519 mod_timer(&qp->s_timer, jiffies + qp->timeout_jiffies);
1520 if (qp->s_flags & QIB_S_WAIT_ACK) {
1521 qp->s_flags &= ~QIB_S_WAIT_ACK;
1522 qib_schedule_send(qp);
1525 if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE))
1526 qp->s_retry = qp->s_retry_cnt;
1529 * Update the RDMA receive state but do the copy w/o
1530 * holding the locks and blocking interrupts.
1532 qp->s_rdma_read_len -= pmtu;
1533 update_last_psn(qp, psn);
1534 spin_unlock_irqrestore(&qp->s_lock, flags);
1535 qib_copy_sge(&qp->s_rdma_read_sge, data, pmtu, 0);
1538 case OP(RDMA_READ_RESPONSE_ONLY):
1539 aeth = be32_to_cpu(ohdr->u.aeth);
1540 if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd))
1542 /* Get the number of bytes the message was padded by. */
1543 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
1545 * Check that the data size is >= 0 && <= pmtu.
1546 * Remember to account for the AETH header (4) and
1549 if (unlikely(tlen < (hdrsize + pad + 8)))
1552 * If this is a response to a resent RDMA read, we
1553 * have to be careful to copy the data to the right
1556 wqe = get_swqe_ptr(qp, qp->s_acked);
1557 qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
1561 case OP(RDMA_READ_RESPONSE_LAST):
1562 /* ACKs READ req. */
1563 if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1)))
1565 if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
1567 /* Get the number of bytes the message was padded by. */
1568 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
1570 * Check that the data size is >= 1 && <= pmtu.
1571 * Remember to account for the AETH header (4) and
1574 if (unlikely(tlen <= (hdrsize + pad + 8)))
1577 tlen -= hdrsize + pad + 8;
1578 if (unlikely(tlen != qp->s_rdma_read_len))
1580 aeth = be32_to_cpu(ohdr->u.aeth);
1581 qib_copy_sge(&qp->s_rdma_read_sge, data, tlen, 0);
1582 WARN_ON(qp->s_rdma_read_sge.num_sge);
1583 (void) do_rc_ack(qp, aeth, psn,
1584 OP(RDMA_READ_RESPONSE_LAST), 0, rcd);
1589 status = IB_WC_LOC_QP_OP_ERR;
1593 rdma_seq_err(qp, ibp, psn, rcd);
1597 status = IB_WC_LOC_LEN_ERR;
1599 if (qp->s_last == qp->s_acked) {
1600 qib_send_complete(qp, wqe, status);
1601 qib_error_qp(qp, IB_WC_WR_FLUSH_ERR);
1604 spin_unlock_irqrestore(&qp->s_lock, flags);
1610 * qib_rc_rcv_error - process an incoming duplicate or error RC packet
1611 * @ohdr: the other headers for this packet
1612 * @data: the packet data
1613 * @qp: the QP for this packet
1614 * @opcode: the opcode for this packet
1615 * @psn: the packet sequence number for this packet
1616 * @diff: the difference between the PSN and the expected PSN
1618 * This is called from qib_rc_rcv() to process an unexpected
1619 * incoming RC packet for the given QP.
1620 * Called at interrupt level.
1621 * Return 1 if no more processing is needed; otherwise return 0 to
1622 * schedule a response to be sent.
1624 static int qib_rc_rcv_error(struct qib_other_headers *ohdr,
1630 struct qib_ctxtdata *rcd)
1632 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
1633 struct qib_ack_entry *e;
1634 unsigned long flags;
1640 * Packet sequence error.
1641 * A NAK will ACK earlier sends and RDMA writes.
1642 * Don't queue the NAK if we already sent one.
1644 if (!qp->r_nak_state) {
1646 qp->r_nak_state = IB_NAK_PSN_ERROR;
1647 /* Use the expected PSN. */
1648 qp->r_ack_psn = qp->r_psn;
1650 * Wait to send the sequence NAK until all packets
1651 * in the receive queue have been processed.
1652 * Otherwise, we end up propagating congestion.
1654 if (list_empty(&qp->rspwait)) {
1655 qp->r_flags |= QIB_R_RSP_NAK;
1656 atomic_inc(&qp->refcount);
1657 list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
1664 * Handle a duplicate request. Don't re-execute SEND, RDMA
1665 * write or atomic op. Don't NAK errors, just silently drop
1666 * the duplicate request. Note that r_sge, r_len, and
1667 * r_rcv_len may be in use so don't modify them.
1669 * We are supposed to ACK the earliest duplicate PSN but we
1670 * can coalesce an outstanding duplicate ACK. We have to
1671 * send the earliest so that RDMA reads can be restarted at
1672 * the requester's expected PSN.
1674 * First, find where this duplicate PSN falls within the
1675 * ACKs previously sent.
1676 * old_req is true if there is an older response that is scheduled
1677 * to be sent before sending this one.
1683 spin_lock_irqsave(&qp->s_lock, flags);
1685 for (i = qp->r_head_ack_queue; ; i = prev) {
1686 if (i == qp->s_tail_ack_queue)
1691 prev = QIB_MAX_RDMA_ATOMIC;
1692 if (prev == qp->r_head_ack_queue) {
1696 e = &qp->s_ack_queue[prev];
1701 if (qib_cmp24(psn, e->psn) >= 0) {
1702 if (prev == qp->s_tail_ack_queue &&
1703 qib_cmp24(psn, e->lpsn) <= 0)
1709 case OP(RDMA_READ_REQUEST): {
1710 struct ib_reth *reth;
1715 * If we didn't find the RDMA read request in the ack queue,
1716 * we can ignore this request.
1718 if (!e || e->opcode != OP(RDMA_READ_REQUEST))
1720 /* RETH comes after BTH */
1721 reth = &ohdr->u.rc.reth;
1723 * Address range must be a subset of the original
1724 * request and start on pmtu boundaries.
1725 * We reuse the old ack_queue slot since the requester
1726 * should not back up and request an earlier PSN for the
1729 offset = ((psn - e->psn) & QIB_PSN_MASK) *
1731 len = be32_to_cpu(reth->length);
1732 if (unlikely(offset + len != e->rdma_sge.sge_length))
1734 if (e->rdma_sge.mr) {
1735 qib_put_mr(e->rdma_sge.mr);
1736 e->rdma_sge.mr = NULL;
1739 u32 rkey = be32_to_cpu(reth->rkey);
1740 u64 vaddr = be64_to_cpu(reth->vaddr);
1743 ok = qib_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey,
1744 IB_ACCESS_REMOTE_READ);
1748 e->rdma_sge.vaddr = NULL;
1749 e->rdma_sge.length = 0;
1750 e->rdma_sge.sge_length = 0;
1755 qp->s_tail_ack_queue = prev;
1759 case OP(COMPARE_SWAP):
1760 case OP(FETCH_ADD): {
1762 * If we didn't find the atomic request in the ack queue
1763 * or the send tasklet is already backed up to send an
1764 * earlier entry, we can ignore this request.
1766 if (!e || e->opcode != (u8) opcode || old_req)
1768 qp->s_tail_ack_queue = prev;
1774 * Ignore this operation if it doesn't request an ACK
1775 * or an earlier RDMA read or atomic is going to be resent.
1777 if (!(psn & IB_BTH_REQ_ACK) || old_req)
1780 * Resend the most recent ACK if this request is
1781 * after all the previous RDMA reads and atomics.
1783 if (i == qp->r_head_ack_queue) {
1784 spin_unlock_irqrestore(&qp->s_lock, flags);
1785 qp->r_nak_state = 0;
1786 qp->r_ack_psn = qp->r_psn - 1;
1790 * Try to send a simple ACK to work around a Mellanox bug
1791 * which doesn't accept a RDMA read response or atomic
1792 * response as an ACK for earlier SENDs or RDMA writes.
1794 if (!(qp->s_flags & QIB_S_RESP_PENDING)) {
1795 spin_unlock_irqrestore(&qp->s_lock, flags);
1796 qp->r_nak_state = 0;
1797 qp->r_ack_psn = qp->s_ack_queue[i].psn - 1;
1801 * Resend the RDMA read or atomic op which
1802 * ACKs this duplicate request.
1804 qp->s_tail_ack_queue = i;
1807 qp->s_ack_state = OP(ACKNOWLEDGE);
1808 qp->s_flags |= QIB_S_RESP_PENDING;
1809 qp->r_nak_state = 0;
1810 qib_schedule_send(qp);
1813 spin_unlock_irqrestore(&qp->s_lock, flags);
1821 void qib_rc_error(struct qib_qp *qp, enum ib_wc_status err)
1823 unsigned long flags;
1826 spin_lock_irqsave(&qp->s_lock, flags);
1827 lastwqe = qib_error_qp(qp, err);
1828 spin_unlock_irqrestore(&qp->s_lock, flags);
1833 ev.device = qp->ibqp.device;
1834 ev.element.qp = &qp->ibqp;
1835 ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
1836 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
1840 static inline void qib_update_ack_queue(struct qib_qp *qp, unsigned n)
1845 if (next > QIB_MAX_RDMA_ATOMIC)
1847 qp->s_tail_ack_queue = next;
1848 qp->s_ack_state = OP(ACKNOWLEDGE);
1852 * qib_rc_rcv - process an incoming RC packet
1853 * @rcd: the context pointer
1854 * @hdr: the header of this packet
1855 * @has_grh: true if the header has a GRH
1856 * @data: the packet data
1857 * @tlen: the packet length
1858 * @qp: the QP for this packet
1860 * This is called from qib_qp_rcv() to process an incoming RC packet
1862 * Called at interrupt level.
1864 void qib_rc_rcv(struct qib_ctxtdata *rcd, struct qib_ib_header *hdr,
1865 int has_grh, void *data, u32 tlen, struct qib_qp *qp)
1867 struct qib_ibport *ibp = &rcd->ppd->ibport_data;
1868 struct qib_other_headers *ohdr;
1874 u32 pmtu = qp->pmtu;
1876 struct ib_reth *reth;
1877 unsigned long flags;
1883 hdrsize = 8 + 12; /* LRH + BTH */
1885 ohdr = &hdr->u.l.oth;
1886 hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */
1889 opcode = be32_to_cpu(ohdr->bth[0]);
1890 if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
1893 psn = be32_to_cpu(ohdr->bth[2]);
1897 * Process responses (ACKs) before anything else. Note that the
1898 * packet sequence number will be for something in the send work
1899 * queue rather than the expected receive packet sequence number.
1900 * In other words, this QP is the requester.
1902 if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
1903 opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
1904 qib_rc_rcv_resp(ibp, ohdr, data, tlen, qp, opcode, psn,
1905 hdrsize, pmtu, rcd);
1909 /* Compute 24 bits worth of difference. */
1910 diff = qib_cmp24(psn, qp->r_psn);
1911 if (unlikely(diff)) {
1912 if (qib_rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd))
1917 /* Check for opcode sequence errors. */
1918 switch (qp->r_state) {
1919 case OP(SEND_FIRST):
1920 case OP(SEND_MIDDLE):
1921 if (opcode == OP(SEND_MIDDLE) ||
1922 opcode == OP(SEND_LAST) ||
1923 opcode == OP(SEND_LAST_WITH_IMMEDIATE))
1927 case OP(RDMA_WRITE_FIRST):
1928 case OP(RDMA_WRITE_MIDDLE):
1929 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
1930 opcode == OP(RDMA_WRITE_LAST) ||
1931 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
1936 if (opcode == OP(SEND_MIDDLE) ||
1937 opcode == OP(SEND_LAST) ||
1938 opcode == OP(SEND_LAST_WITH_IMMEDIATE) ||
1939 opcode == OP(RDMA_WRITE_MIDDLE) ||
1940 opcode == OP(RDMA_WRITE_LAST) ||
1941 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
1944 * Note that it is up to the requester to not send a new
1945 * RDMA read or atomic operation before receiving an ACK
1946 * for the previous operation.
1951 if (qp->state == IB_QPS_RTR && !(qp->r_flags & QIB_R_COMM_EST)) {
1952 qp->r_flags |= QIB_R_COMM_EST;
1953 if (qp->ibqp.event_handler) {
1956 ev.device = qp->ibqp.device;
1957 ev.element.qp = &qp->ibqp;
1958 ev.event = IB_EVENT_COMM_EST;
1959 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
1963 /* OK, process the packet. */
1965 case OP(SEND_FIRST):
1966 ret = qib_get_rwqe(qp, 0);
1973 case OP(SEND_MIDDLE):
1974 case OP(RDMA_WRITE_MIDDLE):
1976 /* Check for invalid length PMTU or posted rwqe len. */
1977 if (unlikely(tlen != (hdrsize + pmtu + 4)))
1979 qp->r_rcv_len += pmtu;
1980 if (unlikely(qp->r_rcv_len > qp->r_len))
1982 qib_copy_sge(&qp->r_sge, data, pmtu, 1);
1985 case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
1987 ret = qib_get_rwqe(qp, 1);
1995 case OP(SEND_ONLY_WITH_IMMEDIATE):
1996 ret = qib_get_rwqe(qp, 0);
2002 if (opcode == OP(SEND_ONLY))
2003 goto no_immediate_data;
2004 /* FALLTHROUGH for SEND_ONLY_WITH_IMMEDIATE */
2005 case OP(SEND_LAST_WITH_IMMEDIATE):
2007 wc.ex.imm_data = ohdr->u.imm_data;
2009 wc.wc_flags = IB_WC_WITH_IMM;
2012 case OP(RDMA_WRITE_LAST):
2017 /* Get the number of bytes the message was padded by. */
2018 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
2019 /* Check for invalid length. */
2020 /* XXX LAST len should be >= 1 */
2021 if (unlikely(tlen < (hdrsize + pad + 4)))
2023 /* Don't count the CRC. */
2024 tlen -= (hdrsize + pad + 4);
2025 wc.byte_len = tlen + qp->r_rcv_len;
2026 if (unlikely(wc.byte_len > qp->r_len))
2028 qib_copy_sge(&qp->r_sge, data, tlen, 1);
2029 qib_put_ss(&qp->r_sge);
2031 if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags))
2033 wc.wr_id = qp->r_wr_id;
2034 wc.status = IB_WC_SUCCESS;
2035 if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) ||
2036 opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
2037 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
2039 wc.opcode = IB_WC_RECV;
2041 wc.src_qp = qp->remote_qpn;
2042 wc.slid = qp->remote_ah_attr.dlid;
2043 wc.sl = qp->remote_ah_attr.sl;
2044 /* zero fields that are N/A */
2047 wc.dlid_path_bits = 0;
2049 /* Signal completion event if the solicited bit is set. */
2050 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
2052 cpu_to_be32(IB_BTH_SOLICITED)) != 0);
2055 case OP(RDMA_WRITE_FIRST):
2056 case OP(RDMA_WRITE_ONLY):
2057 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
2058 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
2061 reth = &ohdr->u.rc.reth;
2062 hdrsize += sizeof(*reth);
2063 qp->r_len = be32_to_cpu(reth->length);
2065 qp->r_sge.sg_list = NULL;
2066 if (qp->r_len != 0) {
2067 u32 rkey = be32_to_cpu(reth->rkey);
2068 u64 vaddr = be64_to_cpu(reth->vaddr);
2071 /* Check rkey & NAK */
2072 ok = qib_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr,
2073 rkey, IB_ACCESS_REMOTE_WRITE);
2076 qp->r_sge.num_sge = 1;
2078 qp->r_sge.num_sge = 0;
2079 qp->r_sge.sge.mr = NULL;
2080 qp->r_sge.sge.vaddr = NULL;
2081 qp->r_sge.sge.length = 0;
2082 qp->r_sge.sge.sge_length = 0;
2084 if (opcode == OP(RDMA_WRITE_FIRST))
2086 else if (opcode == OP(RDMA_WRITE_ONLY))
2087 goto no_immediate_data;
2088 ret = qib_get_rwqe(qp, 1);
2092 qib_put_ss(&qp->r_sge);
2095 wc.ex.imm_data = ohdr->u.rc.imm_data;
2097 wc.wc_flags = IB_WC_WITH_IMM;
2100 case OP(RDMA_READ_REQUEST): {
2101 struct qib_ack_entry *e;
2105 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ)))
2107 next = qp->r_head_ack_queue + 1;
2108 /* s_ack_queue is size QIB_MAX_RDMA_ATOMIC+1 so use > not >= */
2109 if (next > QIB_MAX_RDMA_ATOMIC)
2111 spin_lock_irqsave(&qp->s_lock, flags);
2112 if (unlikely(next == qp->s_tail_ack_queue)) {
2113 if (!qp->s_ack_queue[next].sent)
2114 goto nack_inv_unlck;
2115 qib_update_ack_queue(qp, next);
2117 e = &qp->s_ack_queue[qp->r_head_ack_queue];
2118 if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) {
2119 qib_put_mr(e->rdma_sge.mr);
2120 e->rdma_sge.mr = NULL;
2122 reth = &ohdr->u.rc.reth;
2123 len = be32_to_cpu(reth->length);
2125 u32 rkey = be32_to_cpu(reth->rkey);
2126 u64 vaddr = be64_to_cpu(reth->vaddr);
2129 /* Check rkey & NAK */
2130 ok = qib_rkey_ok(qp, &e->rdma_sge, len, vaddr,
2131 rkey, IB_ACCESS_REMOTE_READ);
2133 goto nack_acc_unlck;
2135 * Update the next expected PSN. We add 1 later
2136 * below, so only add the remainder here.
2139 qp->r_psn += (len - 1) / pmtu;
2141 e->rdma_sge.mr = NULL;
2142 e->rdma_sge.vaddr = NULL;
2143 e->rdma_sge.length = 0;
2144 e->rdma_sge.sge_length = 0;
2149 e->lpsn = qp->r_psn;
2151 * We need to increment the MSN here instead of when we
2152 * finish sending the result since a duplicate request would
2153 * increment it more than once.
2157 qp->r_state = opcode;
2158 qp->r_nak_state = 0;
2159 qp->r_head_ack_queue = next;
2161 /* Schedule the send tasklet. */
2162 qp->s_flags |= QIB_S_RESP_PENDING;
2163 qib_schedule_send(qp);
2168 case OP(COMPARE_SWAP):
2169 case OP(FETCH_ADD): {
2170 struct ib_atomic_eth *ateth;
2171 struct qib_ack_entry *e;
2178 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC)))
2180 next = qp->r_head_ack_queue + 1;
2181 if (next > QIB_MAX_RDMA_ATOMIC)
2183 spin_lock_irqsave(&qp->s_lock, flags);
2184 if (unlikely(next == qp->s_tail_ack_queue)) {
2185 if (!qp->s_ack_queue[next].sent)
2186 goto nack_inv_unlck;
2187 qib_update_ack_queue(qp, next);
2189 e = &qp->s_ack_queue[qp->r_head_ack_queue];
2190 if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) {
2191 qib_put_mr(e->rdma_sge.mr);
2192 e->rdma_sge.mr = NULL;
2194 ateth = &ohdr->u.atomic_eth;
2195 vaddr = ((u64) be32_to_cpu(ateth->vaddr[0]) << 32) |
2196 be32_to_cpu(ateth->vaddr[1]);
2197 if (unlikely(vaddr & (sizeof(u64) - 1)))
2198 goto nack_inv_unlck;
2199 rkey = be32_to_cpu(ateth->rkey);
2200 /* Check rkey & NAK */
2201 if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64),
2203 IB_ACCESS_REMOTE_ATOMIC)))
2204 goto nack_acc_unlck;
2205 /* Perform atomic OP and save result. */
2206 maddr = (atomic64_t *) qp->r_sge.sge.vaddr;
2207 sdata = be64_to_cpu(ateth->swap_data);
2208 e->atomic_data = (opcode == OP(FETCH_ADD)) ?
2209 (u64) atomic64_add_return(sdata, maddr) - sdata :
2210 (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr,
2211 be64_to_cpu(ateth->compare_data),
2213 qib_put_mr(qp->r_sge.sge.mr);
2214 qp->r_sge.num_sge = 0;
2221 qp->r_state = opcode;
2222 qp->r_nak_state = 0;
2223 qp->r_head_ack_queue = next;
2225 /* Schedule the send tasklet. */
2226 qp->s_flags |= QIB_S_RESP_PENDING;
2227 qib_schedule_send(qp);
2233 /* NAK unknown opcodes. */
2237 qp->r_state = opcode;
2238 qp->r_ack_psn = psn;
2239 qp->r_nak_state = 0;
2240 /* Send an ACK if requested or required. */
2241 if (psn & (1 << 31))
2246 qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer;
2247 qp->r_ack_psn = qp->r_psn;
2248 /* Queue RNR NAK for later */
2249 if (list_empty(&qp->rspwait)) {
2250 qp->r_flags |= QIB_R_RSP_NAK;
2251 atomic_inc(&qp->refcount);
2252 list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
2257 qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
2258 qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR;
2259 qp->r_ack_psn = qp->r_psn;
2260 /* Queue NAK for later */
2261 if (list_empty(&qp->rspwait)) {
2262 qp->r_flags |= QIB_R_RSP_NAK;
2263 atomic_inc(&qp->refcount);
2264 list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
2269 spin_unlock_irqrestore(&qp->s_lock, flags);
2271 qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
2272 qp->r_nak_state = IB_NAK_INVALID_REQUEST;
2273 qp->r_ack_psn = qp->r_psn;
2274 /* Queue NAK for later */
2275 if (list_empty(&qp->rspwait)) {
2276 qp->r_flags |= QIB_R_RSP_NAK;
2277 atomic_inc(&qp->refcount);
2278 list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
2283 spin_unlock_irqrestore(&qp->s_lock, flags);
2285 qib_rc_error(qp, IB_WC_LOC_PROT_ERR);
2286 qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR;
2287 qp->r_ack_psn = qp->r_psn;
2289 qib_send_rc_ack(qp);
2293 spin_unlock_irqrestore(&qp->s_lock, flags);